<template>
  <div id="app">
    <a-input placeholder="请输入任务" class="my_ipt" :value="inputValue" @change="handleInputChange" />
    <a-button type="primary" @click="addItemToList">添加事项</a-button>

    <a-list bordered :dataSource="infoList" class="dt_list">
      <a-list-item slot="renderItem" slot-scope="item">
        <!-- 复选框 -->
        <a-checkbox :checked="item.done" @change="cbStateChanged(item.id,$event)">{{item.info}}</a-checkbox>
        <!-- 删除链接 -->
        <a slot="actions" @click="removeItemById(item.id)">删除</a>
      </a-list-item>

      <!-- footer区域 -->
      <div slot="footer" class="footer">
        <!-- 未完成的任务个数 -->
        <span>{{unDoneLength}}条剩余</span>
        <!-- 操作按钮 -->
        <a-button-group>
          <a-button :type="viewKey ==='all'?'primary':'default'" @click="changeList('all')">全部</a-button>
          <a-button :type="viewKey ==='undone'?'primary':'default'" @click="changeList('undone')">未完成</a-button>
          <a-button :type="viewKey ==='done'?'primary':'default'" @click="changeList('done')">已完成</a-button>
        </a-button-group>
        <!-- 把已经完成的任务清空 -->
        <a @click="clean">清除已完成</a>
      </div>
    </a-list>
  </div>
</template>

<script>
  import {
    mapState,
    mapGetters
  } from 'vuex'

  export default {
    name: 'app',
    data() {
      return {}
    },
    created() {
      this.$store.dispatch('getList')
    },
    computed: {
      ...mapState(['inputValue', 'viewKey']),
      ...mapGetters(['unDoneLength', 'infoList'])
    },
    methods: {
      // 监听文本框输入的内容变化，再同步保存到state的inputValue
      handleInputChange(e) {
        this.$store.commit('setInputValue', e.target.value)
      },
      addItemToList() {
        if (this.inputValue.trim().length <= 0) {
          return this.$message.warning('文本框内容不能为空')
        }
        this.$store.commit('addItem')
      },
      removeItemById(id) {
        //根据id删除事项
        this.$store.commit('removeItem', id)
      },
      cbStateChanged(id, e) {
        // 复选框状态改变时触发 需要用到俩参数
        const param = {
          id: id,
          status: e.target.checked
        }
        this.$store.commit('changeStatus', param)
      },
      clean() {
        this.$store.commit('cleanDone')
      },
      changeList(key) {
        this.$store.commit('changeKey', key)
      }
    }
  }
</script>

<style scoped>
  #app {
    padding: 10px;
  }

  .my_ipt {
    width: 500px;
    margin-right: 10px;
  }

  .dt_list {
    width: 500px;
    margin-top: 10px;
  }

  .footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
</style>